EP1626290A1

EP1626290A1 - Image-acquisition module which is intended for monitoring the external environment of a vehicle

Info

Publication number: EP1626290A1
Application number: EP03727516A
Authority: EP
Inventors: Santiago c/Sant Francesc Xavier 22 MIGUEL SANZ; Daniel Bande Martinez
Original assignee: Ficomirrors SA
Current assignee: Ficomirrors SA
Priority date: 2003-05-22
Filing date: 2003-05-22
Publication date: 2006-02-15
Anticipated expiration: 2023-05-22
Also published as: US7929048B2; US20060139482A1; WO2004104626A1; AU2003233805A1; ES2374533T3; JP4423208B2; ATE527556T1; EP1626290B1; JP2006526135A

Abstract

Image acquisition module comprising: a housing (1) with a protected interior against at least moisture and a window (6) hermetically closed by a transparent element (35); an electronic circuit (4) accommodated in said housing (1) and associated with connection means with the exterior for supply and for bidirectional signal exchange; an image detector (5) connected to said electronic circuit (4) and facing said window (6); a support (7) attached to the housing (1) to carry an optical system (8) between said image detector (5) and said window (6); and positioning and releasable fixation means to enable the focussing of said optical system (8) and the releasable fixation of the module to an exterior structure of a vehicle.

Description

Scope of the invention

The present invention relates to an image acquisition module for monitoring applications of the external surroundings of a vehicle, consisting of a housing, fixable in a releasable manner to an external structure of a vehicle, which protects and accommodates an image detector in its interior, associated with an electronic circuit which, through an optical system, executes the mentioned image acquisition.

Antecedents of the invention

The patent application EP-A-0591743 describes a device detecting relative positions between vehicles, by means of an optical sensor associated with a rear view mirror, being this optical sensor associated with an electronic processing unit connected to a central information system of the vehicle, receiving the latter the processed signals. Even though, in the mentioned antecedent one states the possibility of the device consisting of an optoelectronic sensor based on CCD technology, its structure is not described in detail and, furthermore, no characteristics are given, nor is the system described where the optical device is integrated, nor anything about the physical location of the device within the vehicle.
The patent application WO-A-01/61371 of the same applicant describes an object presence detection device similar to the object of the present intervention, however, in that case, specially referring to the process followed when acquiring and processing the images, once digitalized and previously amplified, as well as referring to the different calculation algorithms susceptible to being used. In this antecedent, one describes that a photo sensor and an electronic circuit, responsible for the digitalization of images, are physically united in a multi-chip module, however, as in the previous patent application, one does not describe how this device is disposed or physically mounted in the vehicle.
In the mentioned antecedents, even though reference is made to its location in a vehicle, and one has stated the possibility that both, the optic sensor and the processing unit, are disposed in the interior of a rear view mirror of the vehicle carrying housing, no mention is made to isolation devices for themselves regarding ambient and external conditions, as for example rain, moisture, dirt, strikes, etc., nor to the protection referring to luminous incidence.
The patent US-5221964 describes an expandable camera module CCD similar to the object of the present application, regarding the inclusion of an optical sensor and an associated circuit in the interior of a housing, in this case a metallic one with tubular form, for its protection regarding the exterior. However, no mention is made to whether it is hermetically closed, or if the camera is protected against rain and adverse luminous conditions. Furthermore, no suggestion is made about the possibility of the mentioned module for being used for a vehicle.
Therefore, it is necessary to offer an alternative to these antecedents, in the form of a module similar to the one explained in the previous patents and patent applications, however, focussing on its physical implementation for its installation into a vehicle, offering a better isolated and protected means from the exterior as the already known, both from the external agents, and from moisture, dust, for example, as well as from luminous incidences which may alter, and even damage almost fully, the image quality to be acquired by the camera..
The purpose of the present invention is to offer an image acquisition module for monitoring applications of the external surroundings of a vehicle, in particular of an automobile or a truck, including the advantages stated in the previous paragraph, i.e. to warrant a good operation under various types of adverse situations, arising from external agents, as well as from the luminous incidence impacting on the mentioned module.

Short description of the invention

The image acquisition module for monitoring applications of the external surroundingsof a vehicle consists of the following: a housing with a protected interior, at least from moisture and a hermetically closed window by a transparent element, which incorporates in its interior an electronic circuit associated with connecting means to the exterior, an image detector connected to said electronic circuit and opposed to said window, a supporting device connected to the mentioned housing to carry an optical system between the said image detector and the said window; as well as positioning means and releasable fixation means, in order to facilitate at least the focussing of said optical system and the releasable fixation of the module to an external structure of the vehicle. Furthermore, said module disposes of incorporated protection meansprotection means from external agents and luminous incidences, materialised in the form of a visor element, a car gutter, as well as conditioning means regarding the light pass through the mentioned transparent element.
A mounting adapter has been provided for, in which said visor element and car gutter are integrated, around its opening, in order to couple the housing to the mentioned external structure of a vehicle. Therefore, the mentioned mounting adapter comprises at least focussing and releasable fixation means for the fixation of the housing in cooperation which said focussing means and said releasable fixation means of the housing, guaranteeing a predetermined location of said opening and the visor and car gutter elements in relation to the window, as well as releasable fixation means for the releasable fixation of said mounting adapter to said exterior structure of a vehicle.

Short description of the drawings

Other characteristics of the invention will appear clearer starting from the following description of preferred embodimentpreferred embodiments, illustrated in the enclosed drawings, which shall be regarded in an illustrative but not limiting manner.
The enclosed drawings show the following:

Fig. 1 shows a transversal section view of an image acquisition module, where one may observe a housing with a series of components in its interior, as well as a wiring associated with a connector.
Fig. 2 is a ground view of the Fig. 1 module, where one may appreciate part of the positioning and fixation system of the mentioned module.
Fig. 3 is a front elevation view of an image acquisition module coupled to a mounting adapter, of a first preferred embodiment.
Fig. 4 is a side elevation view, partially sectioned, of the module and adapter assembly of Fig. 3.
Fig. 5 is a ground view, partially sectioned, of the module and adapter assembly of Fig. 3.
Fig. 6 is a ground view of the module and adapter assembly of Fig. 3.
Fig. 7 is a ground view of the module and adapter assembly of Fig. 3 in an exterior structure of a vehicle.
Fig. 8 is a side elevation view, partially sectioned, of an image acquisition module coupled to a mounting adapter, and mounted on an exterior structure of a vehicle, of a second preferred embodiment. An extended detail has been extracted therefrom.
Fig. 9 is a side elevation view, partially sectioned, of an image acquisition module, with a wiring associated with a connector and coupled to a mounting adapter, of a third preferred embodiment.

Detailed description of an preferred embodiment

The following explanation will refer to all the exposed figures whenever the stated facts are common to all the described preferred embodimentpreferred embodiments. When explaining a specific peculiarity or characteristic of a certain preferred embodiment, this will be duly indicated.
As shown by these figures, the image acquisition module for monitoring applications of the external surroundings of a vehicle comprises:

a housing 1 with a protected interior at least from moisture and a hermetically closed window 6 by a transparent element 35;
an electronic circuit 4 accommodated in said housing 1 and associated with connection means with the exterior, for the supply and bidirectional signal exchange;
an image detector 5 connected to said electronic circuit 4 and facing said window 6, advantageously integrated in an A.S.I.C.
a support 7 attached to the housing 1, in order to carry an optical system 8 between said image detector 5 and said window 6; and
positioning means and releasable fixation means, in order to facilitate, at least, the focussing of said optical system 8 and the releasable fixation of the module to an exterior structure 36 of a vehicle.

The referred housing 1 consists of two concave halves 11, 12 with respective perimetral borders 13, 14, facing each other, disposed back-to-back throughout a joint 15 and respective continuous flanges extended externally, adjacent to said perimetral borders 13, 14, being provided with an annular elastic sealing element 30 embracing both continuous flanges and covering said joint 15. In a portion of at least one of said perimetral borders 13, 14 there is a recess to provide an exit for a multicore wiring 2, executed for example by means of a flexible printed circuit. Said annular elastic sealing element 30 comprises a longitudinal slit adjacent to said exit for the mentioned multicore wiring 2, through which slit passes the multicore wiring 2.
In a possible preferred embodiment the previously mentioned optical system 8 comprises a tubular body defining an external flange 31 and an externally screw threaded portion 32, and said support 7 comprises an appendix 16, of tubular configuration, protruding from one of the concave halves 11, 12 of housing 1 including said appendix 16 an internal screw thread screw-coupled to the optical system 8.
An elastic sealing element 34 is disposed in compressed form between said external flange 31 of the optical system's body 8 and one end of the appendix 8, with the aim to protect the accommodated components in the interior of the housing 1 from moisture. This protection is achieved, furthermore, by disposing the mentioned transparent element 35 between one end of the optical system 8 and one interior backing of a cover 17 coupled externally with said appendix 16, consisting said window 6 of an opening in the background wall of the cover (17) .
The mentioned appendix 16, of the support 7 of the housing 1, is cylindrical and externally screw threaded, and the mentioned cover 17 is, furthermore, cylindrical and internally screw threaded, in order to screw-couple the appendix 16, which includes an axial slot 33 in the external screw thread for the pass of, at least, one electrical cable.
Said appendix 16 is integral of one of said concave halves 11, 12 of housing 1 which, as well as cover 17, were obtained optionally by injection moulding with a high coefficient of heat conductivity material.
The mentioned window is associated with protection meansprotection means from external agents and the luminous incidence, guaranteeing an appropriate light pass through said transparent element 35. Said protection means are materialized in the form of a visor element 10 disposed around of at least a part of said window 6, acting as a protection in case of rain, avoiding the incidence of rain drops on the window, and, furthermore, will protect camera from the sunrays a car gutter element 27 disposed around of at least a part of said window 6, offering a way out for water in the mentioned case of rain, projecting water to the ground and avoiding water from accumulating in front of the window. Said visor element 10 together with said car gutter will form , in case both of them together surround completely the window 6, a front depression 19 (Fig. 8 and 9), that in a preferred embodiment could be extended into a tubular configuration 20 (see Fig. 9) externally connected to a plug around the mentioned support 7 for the optical system 8. Said window 6 is, furthermore, associated with conditioning means of the onditions of the light pass through said transparent element 35, avoiding in particular steam and ice deposit, and that ing comprise an electrical heating device 9 associated with the mentioned transparent element 35 and/or an optical system 8, in connection with said connection means with the exterior, and forming at least a resistance in the form of a printed ring deposited in at least one face of a peripheral area of the transparent element 35 and connected to the current supply.
The mentioned connection means with the exterior, for the supply and bidirectional signal exchange, could consist of a multicore wiring 2, in the form of a flat tape attached to an exterior multiple connector 3, which, in another preferred embodiment could be directly integrated in the housing 1, and therefore not needing of said multicore wiring 2, or even without needing , the multiple connector 3 and the multicore wiring 2, being both substituted by a radio or infra-red ray signals emitter/receptor, for example.
The mentioned visor element 10 is in a certain angle inclined outwards and upwards, between 0 and 15°, in respect of a central vision line of the image detector 5, and said car gutter element 27 is in a certain angle inclined outwards and downwards, between 45° and 90°, in respect of a central vision line of the image detector of image 5. Another characteristic of both configurations is that some of the more protruding zones of the visor 10 and/or car gutter elements 27 are at a certain distance of a plan in which the window 6 is disposed, not less than the diameter of the window 6.
The said housing 1 could be directly coupled to an exterior part of a vehicle, or even attached by means of a mounting adapter 18. In this second case, the mentioned visor element 10 and car gutter element 27 could be integrated around an opening 28 of said mounting adapter 18, including focussing means and releasable fixation means for the fixation of said housing 1, possibly of various and different type depending on the application example, which will be properly explained later on, in cooperation with said focussing means and releasable fixation means for the fixation of said housing 1, guaranteeing a predetermined position of said opening 28 and visor 10 (Figs. 3 and 9) and car gutter elements (Figs. 8 and 9) in relation to the window 6, and releasable fixation means for the releasable fixation of said mounting adapter 18 to said external structure 36 of a vehicle.
In the case the housing 1 is directly coupled to an external structure 36 of a vehicle, said mounting could be executed in two ways, depending on if the visor 10 and car gutter elements 27 would be disposed in said external structure 36 of a vehicle or in the housing 1 itself. In the first case, said visor 10 and car gutter elements 27 would be integrated around an existing opening in said external structure 36 of a vehicle, including focussing means and releasable fixation means for the fixation of said housing 1 and the external structure 36 of a vehicle, in cooperation with said focussing means and said releasable fixation means of the housing 1, guaranteeing a predetermined position of said opening and visor 10 and car gutter elements 27 in relation to the window 6. In any of both cases, the module fixation to the external structure 36 of a vehicle could be executed in several ways, for example configuration by form-fitting, an example thereof could be that the external structure 36 of a vehicle is a rear view mirror housing, previewing a cavity therein or the fitting of the housing 1 thereinto and a lid covering the cavity trapping an immobilizing in position the module within said cavity.
The mentioned releasable fixation means for the fixation of mounting adapter 18 to external structure 36 of a vehicle, may include elastic pressurized fixation means 29, as may be seen in Fig. 6, or screws 37, as may be seen in Fig. 8, or fixation configurations by form-fitting, or a combination of the mentioned elastic pressurized fixation means 29 with the cited configuration by form-fitting, as may be observed in Fig. 7.
Concerning the releasable fixation between the mounting adapter 18 and the housing 1, in the three preferred embodiments shown in the figures, this is made by means of at least a pair of elastic arms 21 ending in projections 22, for example in the form of a nail extending themselves from the mounting adapter 18, in order to laterally embrace the housing 1 and snap-fit fixate, by means of said projections 22, on shoulders existing in the housing 1. Obviously, any other fixation alternative would be possible, as for example the fixation by means of screws or form-fitting, in which case an internal face of the mounting adapter 18 could by provided with a configuration in which the housing 1 and the arms analogous to the ones described before, would fit in order to immobilize the housing 1.
With regards to the previously mentioned focussing means between the adapter 18 and the housing 1, these comprise support members 24 (Fig. 8 and detail) integrated in the mounting adapter 18 (in case this adaptor is necessary) which are attached to a front part of the housing 1 with a view to maintain the visor 10 and car gutter elements 27 and said opening 28 at a predetermined distance from the window 6. Said support members 24 dispose at their ends of holes 25, in which stubs 23 which protrude from a part of the housing 1 are inserted. The tubular configuration 20 (see Fig. 9) previously described, would also help for the focussing between the mounting adapter 18 and the housing 1, once it is connected exteriorly to the plug around said support 7 for optical system 8.
The mentioned external structure 36 of a vehicle, in which the module object of the present invention could be installed, could consist of a rear view mirror housing of a vehicle, or a bumper, or any other part of the same, in particular a receptacle susceptible of being used therefor.
When comparing figures 4, 8 and 9, we may observe how the form, size and angle of the visor 10 and car gutter elements 27 are different in each case, observing that in Fig. 4 the car gutter element 27 does not even exist. All this shows the different possible mounting adapters which can be used for the same task.
An expert in the state of the art could introduce changes and modifications in the described preferred embodiments without leaving aside the scope of the invention as defined by the enclosed claims.

Claims

Image acquisition module for monitoring applications of the external surroundings of a vehicle, characterized in that it comprises:
- a housing (1) with an interior protected against at least moisture and a window (6) hermetically closed by a transparent element (35);

- a electronic circuit (4) accommodated in said housing (1) and associated with connection means with the exterior, for supply and/or bidirectional signal exchange;

- an image detector (5) connected to said electronic circuit (4) and opposed to said window (6);

- a support (7) attached to the housing (1) to carry an optic system (8) between said image detector (5) and said window (6); and

- positioning means and releasable fixation means to enable at least the focussing of said optic system (8) and the releasable fixation of the module to an external structure (36) of a vehicle.
Module, according to claim 1, wherein said window (6) is associated with at least one protection device from external agents and from the luminous incidence, guaranteeing an appropriate light pass through said transparent element (35).
Module, according to claim 2, wherein said protection device, which is at least one, comprises a visor element (10) disposed around at least a part of said window (6).
Module, according to claim 3, wherein the protection device comprises, furthermore, a car gutter element (27) disposed around at least another part of said window (6).
Module, according to claim 1, wherein said window (6) or said support (7) are, furthermore, associated with conditioning means of the light pass conditions through said transparent element (35).
Module, according to claim 5, wherein said conditioning means comprise an electric heater device (9) associated with said transparent element (35) and/or with said optical system (8) and being supplied from said connection means with the exterior.
Module, according to claim 4, wherein said visor (10) and car gutter elements (27) are integrated around an opening (28) of a mounting adapter (18) of the housing (1), including said adapter (18) focussing means and releasable fixation means for the fixation of said housing (1) in cooperation with said focussing means and said releasable fixation means of the housing (1) guaranteeing a predetermined position of said opening (28) and visor (10) and car gutter elements (27) in relation to the window (6), and releasable fixation means for the releasable fixation of said mounting adapter (18) to said external structure (36) of a vehicle.
Module, according to claim 4, wherein said visor (10) and car gutter elements (27) are integrated around an opening existing in said external structure (36) of a vehicle, including focussing means and releasable fixation means for the fixation of said housing (1) to the external structure (36) of a vehicle in cooperation with said focussing means and said releasable fixation means of the housing (1) guaranteeing a predetermined position of said opening (28) and of the visor (10) and car gutter elements (27) in relation to the window (6).
Module, according to claim 4, wherein said visor (10) and car gutter elements (27) are part of the housing (1) itself.
Module, according to claim 1, wherein said connection means with the exterior, for the supply and/or for bidirectional signal exchange, are linked to an exterior multiple connector (3).
Module, according to claim 10, wherein said exterior multiple connector (3) is incorporated into housing (1).
Module, according to claim 10, wherein said exterior multiple connector (3) is disposed at the end of a multicore wiring (2).
Module, according to claim 12, wherein said multicore wiring (2) has the form of a flat tape.
Module, according to claim 12, wherein said multicore wiring (2) is a printed flexible circuit.
Module, according to claim 1, wherein said connection means with the exterior, for the supply and/or the bidirectional signal exchange, are materialized in the form of an emitter/receptor of electromagnetic waves.
Module, according to claim 15, wherein said emitter/receptor of electromagnetic waves is a radio signals emitter/receptor.
Module, according to claim 15, wherein said emitter/receptor of electromagnetic waves is an infra-red rays signals emitter/receptor.
Module, according to claim 1, wherein said image detector (5) is part of an integrated circuit.
Module, according to claim 18, wherein said integrated circuit is an A.S.I.C.
Module, according to claim 7 or 8, wherein said releasable fixation means for the fixation of the mounting adapter (18) to the exterior structure (36) of a vehicle include pressurized elastic fixation elements 29).
Module, according to claim 7 or 8, wherein said releasable fixation means for the fixation of the mounting adapter (18) to the exterior structure (36) of a vehicle include form-fitting fixation configurations .
Module, according to claim 7 or 8, wherein said releasable fixation means for the fixation of the mounting adapter (18) to the exterior structure (36) of a vehicle include screws (37).
Module, according to claim 7 or 8, wherein said exterior structure (36) of a vehicle is an exterior rear view mirror housing of a vehicle.
Module, according to claim 3, wherein said visor element (10) is in a small angle inclined outwards and upwards regarding a central vision line of the image detector (5).
Module, according to claim 24, wherein said small angle is approximately in an interval between 0 and 15°.
Module, according to claim 4, wherein said car gutter (27) is in a certain angle inclined outwards and downwards in respect of a central vision line of the image detector (5).
Module, according to claim 26, wherein said angle is approximately in the interval between 45° and 90°.
Module, according to claim 3 or 4, wherein some of the more protruding zones of the visor (10) and/or car gutter elements (27) are at a certain distance of a plan in which the window (6) is disposed not less than the window diameter (6).
Module, according to claim 1, wherein said housing (1) consists of two concave halves (11, 12) with respective perimetral borders (13, 14) opposed to each other and back-to-back throughout a joint (15).
Module, according to claim 29, wherein said concave halves (11, 12) are provided with respective continuous flanges extended externally and adjacent to said perimetral borders (13, 14), being an annular elastic sealing element(30) embracing both continuous flanges and covering said joint (15).
Module, according to claim 30, wherein in a part of at least one of said perimetral borders (13, 14) there is a recess to provide an exit for a multicore wiring (2).
Module, according to claim 31, wherein said annular elastic sealing element(30) comprises a longitudinal slit adjacent to said exit for said multicore wiring (2), through which slit the multicore wiring (2) passes.
Module, according to claim 29, wherein said optical system (8) is integrated in a tubular body defining an external flange (31) and an externally screw threaded portion (32), and said support (7) comprises an appendix (16) protruding from one of said two concave halves (11, 12) of the housing (1), including said appendix (16) an internal screw thread to which the optical system (8) is screw coupled.
Module, according to claim 33, wherein at least one elastic sealing element(34) is included, compressed between said external flange (31) of the optical system body (8) and an appendix end (16).
Module, according to claim 34, wherein said transparent element (35) is disposed between one end of the optical system (8) and an inner bottom wall of a cover (17) externally coupled to said appendix (16), consisting said window (6) of an opening in said inner bottom wall of said cover (17).
Module, according to claim 35, wherein an electrical heater (9) is included, consisting of at least one resistance in the form of a printed ring or deposited in at least one face of a peripheral area of the transparent element (35) and connected to current supply.
Module, according to claim 35, wherein said appendix (16) is cylindrical and externally screw threaded, and the cover (17) is cylindrical and internally screw threaded in order to screw couple the appendix (16).
Module, according to claim 37, wherein said appendix (16) includes an axial slot (33) in the external screw thread, for, at least, the pass of a current supply cable.
Module, according to claim 38, wherein said appendix (16) is integral of one of said concave halves (11, 12) of the housing (1), which are obtained by injection moulding of a high-coefficient heat conductivity material.
Module, according to claim 35, wherein said cover (17) is obtained by injection moulding of a high-coefficient heat conductivity material.